NCERT Solutions for Class 8 Science Chapter 13: In this article, we will provide you with detailed, step-by-step Class 8 Science NCERT Solutions for Chapter 13 – Sound. All solutions provided in this article are solved by a team of academic experts at Embibe. We have included detailed explanations with examples for all answers so that students can understand the concepts as well. NCERT Solution of Class 8 Science Chapter 13 is prepared in the most simplified manner so that students do not face any difficulty.
Students can also download the Class 8th Science Chapter 13 Question Answer as a PDF for free from this page. We have provided accurate and error-free solutions to all the exercises and in-text questions provided in the NCERT Books for Class 8 Science that aligns with the CBSE curriculum. Going through these solutions will guarantee completed homework on time as well as high scores in the final exam.
NCERT Solutions For Class 8 Science Chapter 13: Sound
Before getting into the detailed NCERT Solution Class 8 Science Chapter 13, let’s have an overview of topics and subtopics included in the Sound chapter. The different topics covered in this chapter are tabulated below. Click on any topic name to download the solutions as a PDF.
|Ex – 13.1||Sound is Produced by a Vibrating Body|
|Ex – 13.2||Sound Produced by Humans|
|Ex – 13.3||Sound Needs a Medium of Propagation|
|Ex – 13.4||We Hear Sound through Our Ears|
|Ex – 13.5||Amplitude, Time Period and Frequency of a Vibration|
|Ex – 13.6||Audible and Inaudible Sounds|
|Ex – 13.7||Noise and Music|
|Ex – 13.8||Noise Pollution|
NCERT Book Class 8 Science Chapter 13: Solved Exercises And In-Text Questions
The solutions provided here on Embibe are solved in an easy-to-understand language for all CBSE Class 8 students. This helps them understand the concepts, thus, encouraging active learning and not just rote learning.
Download CBSE Class 8 Solutions for Science for other chapters from the table below:
- Chapter 1 – Crop Production and Management
- Chapter 2 – Microorganisms: Friend and Foe
- Chapter 3 – Synthetic Fibers And Plastics
- Chapter 4 – Materials: Metals and Non-Metals
- Chapter 5 – Coal and Petroleum
- Chapter 6 – Combustion and Flame
- Chapter 7 – Conservation of Plants and Animals
- Chapter 8 – Cell – Structure and Functions
- Chapter 9 – Reproduction in Animals
- Chapter 10 – Reaching the Age of Adolescence
- Chapter 11 – Force and Pressure
- Chapter 12 – Friction
- Chapter 14 – Chemical Effects of Electric Current
- Chapter 15 – Some Natural Phenomena
- Chapter 16 – Light
- Chapter 17 – Stars and the Solar System
- Chapter 18 – Pollution of Air and Water
CBSE NCERT Solutions For Class 8 Science Chapter 13: Chapter Summary
From where does sound come? How is it produced? Sound is produced by anything that is vibrating. A bell rings because it vibrates. You can speak because your vocal cords vibrate. All these vibrations are in the range at which human ears can catch it and interpret it as sound. Elephants can listen to the minute sound created by your feet which even you cannot hear. Why is that? Because elephants have a broader range of catching the vibrations which humans do not possess.
The motion of an object to and fro is referred to as vibration or waves. Some vibrations have so little amplitude that you can only see the motion but not hear the sound it produces. Sound always need some medium to travel. In our case, the air is acting as the medium for sound to travel. If there is no air then you will not be able to listen to anything because the waves have no medium to travel and reach to your ears. When there is no medium (not necessarily air), it is called a vacuum. The medium can be water or wood or any solid. The time taken by sound to travel from source to destination is different for different mediums. In this chapter, you will learn all these things about sound.
FAQs Related To NCERT Science Class 8 Chapter 13
Here we have provided some of the frequently asked questions related to NCERT Science Book Class 8 Chapter 13:
(a) Baby girl
(b) Baby boy
(c) A man
(d) A woman
A: The correct answer is (c) A man.
(a) Sound cannot travel in a vacuum. (T/F)
(b) The number of oscillations per second of a vibrating object is called its time period. (T/F)
(c) If the amplitude of vibration is large, the sound is feeble. (T/F)
(d) For human ears, the audible range is 20 Hz to 20,000 Hz. (T/F)
(e) The lower the frequency of vibration, the higher is the pitch. (T/F)
(f) Unwanted or unpleasant sound is termed as music. (T/F)
(g) Noise pollution may cause partial hearing impairment. (T/F)
A: a) True
(a) Time taken by an object to complete one oscillation is called __________.
(b) Loudness is determined by the __________ of vibration.
(c) The unit of frequency is __________
(d) Unwanted sound is called __________ .
(e) The shrillness of a sound is determined by the __________ of vibration.
A: (a) Time taken by an object to complete one oscillation is called time period.
(b) Loudness is determined by the amplitude of vibration.
(c) The unit of frequency is Hertz.
(d) Unwanted sound is called Noise.
(e) The shrillness of a sound is determined by the frequency of vibration.
A: a) Dholak- It consists of a head which is a stretched membrane. Vibrations are set into these stretched strings when the head is beaten gently, these vibrations produce sound and thus Dholak produces sound.
b) Sitar – It is a musical instrument. Stretched strings are part of it. Vibrations are produced when the string is plucked when played. These vibrations produce sound, thus sitar produces sound.
c) Flute – It’s an instrument which has holes in it. It is a hollow pipe. The air inside the pipe is set into vibration when air is blown over its mouth and this produces a pleasant sound.
A: Some common sources of noise pollution are:
(a) Bus and car horns.
(b) Firecrackers and loudspeakers.
(c) High volumes in televisions and transistors.
(d) mixers at home
(e) Sirens from factories
A: Speed of the light is more than the speed of sound. Thus, lightning is seen first which is accompanied by thunder later.
So, now you have all the detailed NCERT Solution for Class 8 Science Chapter 13 (Sound). Make the best use of these solutions and master this chapter. It will help you in future grades as well.
We hope this article on NCERT Class 8 Science Chapter 13 notes helps you. Refer to the solutions that we have provided in this article. If you have any queries, feel free to ask in the comment section below and we will get back to you at the earliest.
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